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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da18ee96a04b9a336ff308b8cfeb37b79174e52ee2aa221ef4c22c4e28254371' 
  AND token = 'TJaGmgE0J88imGMrbiigE4ol7Hp+L+5Cys6zHCZ1JWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}